component without recurrence properties should enumerate just itself only if it is within the period between starting and before
* added the :overlapping option to OccurrenceEnumerator#occurrences - Allows the enumeration of occurrences which are either partiall or completely within a timespan given by a pair of Dates/Times/DateTimes
* Fixed some Ruby 1.9 incompatibilities
* Added some new rake tasks to run specs under multi-ruby